Obsidian

Obsidian is a type of volcanic glass, a rock that is formed as a result of magmatic activity, when there is a rapid contact of hot acid and viscous lava with a cold environment and subsequent rapid solidification. The rock is very rich in SiO2 compounds and is a natural form of glass.
Since the Paleolithic and Neolithic, obsidian has been used to make tools, mainly scrapers, spearheads or knives. The oldest archaeological find documenting the use of obsidian dates back to Mesopotamia about 9000 years ago. In South America, it was used by shamans as protection against evil forces, and preserved objects made of obsidian have been preserved. To this day, magical properties are attributed to him